From nobody Tue Feb 10 16:18:33 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 6A69885283 for ; Sat, 17 Aug 2024 05:09:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723871374; cv=none; b=ZF1Nu21DY6XNLPkIFZutTADH8IELyF2Hl/g5pm/3e3M4PplkMlX9WN8qDP9QXuR2Ulmac+KAj9AwuQDBYY/bmSMniMPK4BATR/SDNjd8j0C7XWzWwyMEzZKQ0jgFS38gh20zHrPhuTS78AbRw2HxINr0XrNHDqrvhqDdfVRipkU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723871374; c=relaxed/simple; bh=pIv8/Aymq35M3mk+Ip2dqi+IlPE8wYobMr4oum9ku1Y=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=YTnpN7TFJIuJS6M5Mg7dtuTpZvfoYzwfTRHZFzSSSrVYODj7o5Bvg4YjqlbGJYEqeZjJlPVnu0VcUuG77k2mr9F/Dy7Ppjw+b+zwMa9TOjm3uOMGdD344U6vAJbkF7X49nDEJxr3am20Vnh3fb7O8YIu5s1zx1x3JRmMKsCF4/c= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=ioVR7Rqr; arc=none smtp.client-ip=198.175.65.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="ioVR7Rqr" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723871372; x=1755407372; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=pIv8/Aymq35M3mk+Ip2dqi+IlPE8wYobMr4oum9ku1Y=; b=ioVR7Rqr9ZgapfLWy4X+8U+OtZ98GG8Q+eOWXgGRZqMyk3GtFWPsFrM+ s9A2xNsYdDO9d7zHmM/UAY8hFYQ37263kzjgECEHhlkSOxaWuxajv/xQv 9UR4dyoVIekgcuXmLMtUf3ldjSH5j8kVemYG0g6+qhNPGsAAkN0AvSxv6 yO/YkkxFxLbX83sumQlqQhODtq25V82Zj8RAz+2NN8octvcxdEbb4n6p0 bdEhV4ENLzcRewcx+7dVOeEBLuyolN6DQ2o60Zao1vdIbXqtuw6e6oT8Z Se2Ypnh5qfTF4dANEsfk3Dn1tpP8KiHtpT8UF1EK2XqWkE502kZ0sZ4vG w==; X-CSE-ConnectionGUID: i683/gphS+S53/42wCH/ag== X-CSE-MsgGUID: jchyHopvQAacm/kbxZwHIw== X-IronPort-AV: E=McAfee;i="6700,10204,11166"; a="25929485" X-IronPort-AV: E=Sophos;i="6.10,154,1719903600"; d="scan'208";a="25929485" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Aug 2024 22:09:22 -0700 X-CSE-ConnectionGUID: G3ES7ewjRXi5YjsXLL3eQQ== X-CSE-MsgGUID: fZPmCcW6RFSDaGvIag7BFg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,154,1719903600"; d="scan'208";a="60141501" Received: from jf5300-b11a338t.jf.intel.com ([10.242.51.6]) by orviesa006.jf.intel.com with ESMTP; 16 Aug 2024 22:09:22 -0700 From: Kanchana P Sridhar To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hannes@cmpxchg.org, yosryahmed@google.com, nphamcs@gmail.com, ryan.roberts@arm.com, ying.huang@intel.com, 21cnbao@gmail.com, akpm@linux-foundation.org Cc: nanhai.zou@intel.com, wajdi.k.feghali@intel.com, vinodh.gopal@intel.com, kanchana.p.sridhar@intel.com Subject: [PATCH v3 4/4] mm: swap: Count successful mTHP ZSWAP stores in sysfs mTHP stats. Date: Fri, 16 Aug 2024 22:09:21 -0700 Message-Id: <20240817050921.18462-5-kanchana.p.sridhar@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240817050921.18462-1-kanchana.p.sridhar@intel.com> References: <20240817050921.18462-1-kanchana.p.sridhar@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If zswap_store() successfully stores an mTHP, it will be counted under the per-order sysfs "zswpout" stats: /sys/kernel/mm/transparent_hugepage/hugepages-*kB/stats/zswpout Other block dev/fs mTHP swap-out events will be counted under the existing sysfs "swpout" stats: /sys/kernel/mm/transparent_hugepage/hugepages-*kB/stats/swpout Signed-off-by: Kanchana P Sridhar --- mm/page_io.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/page_io.c b/mm/page_io.c index ff8c99ee3af7..debd04fbdfd0 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -172,6 +172,12 @@ int generic_swapfile_activate(struct swap_info_struct = *sis, goto out; } =20 +static inline void count_mthp_zswpout_vm_event(struct folio *folio) +{ + if (IS_ENABLED(CONFIG_THP_SWAP)) + count_mthp_stat(folio_order(folio), MTHP_STAT_ZSWPOUT); +} + /* * We may have stale swap cache pages in memory: notice * them here and get rid of the unnecessary final write. @@ -196,6 +202,7 @@ int swap_writepage(struct page *page, struct writeback_= control *wbc) return ret; } if (zswap_store(folio)) { + count_mthp_zswpout_vm_event(folio); folio_unlock(folio); return 0; } --=20 2.27.0